Add tests for issues with multiple labels

spec/features/projects/labels/issues_sorted_by_priority_spec.rb

@@ -5,31 +5,23 @@ feature 'Issue prioritization', feature: true do
   let(:user)    { create(:user) }
   let(:project) { create(:project, name: 'test', namespace: user.namespace) }
 
+  # Labels
+  let(:label_1) { create(:label, title: 'label_1', project: project, priority: 1) }
+  let(:label_2) { create(:label, title: 'label_2', project: project, priority: 2) }
+  let(:label_3) { create(:label, title: 'label_3', project: project, priority: 3) }
+  let(:label_4) { create(:label, title: 'label_4', project: project, priority: 4) }
+  let(:label_5) { create(:label, title: 'label_5', project: project) } # no priority
+
   # According to https://gitlab.com/gitlab-org/gitlab-ce/issues/14189#note_4360653
-  context 'when assigned with prioritized labels' do
+  context 'when issues have one label' do
     scenario 'Are sorted properly' do
-      login_as user
-
-      label_1 = create(:label, title: 'label_1', priority: 1)
-      label_2 = create(:label, title: 'label_2', priority: 2)
-      label_3 = create(:label, title: 'label_3', priority: 3)
-      label_4 = create(:label, title: 'label_4', priority: 4)
-      label_5 = create(:label, title: 'label_5') # no priority
-
-      project.labels << label_1
-      project.labels << label_2
-      project.labels << label_3
-      project.labels << label_4
-      project.labels << label_5
 
+      # Issues
       issue_1 = create(:issue, title: 'issue_1', project: project)
       issue_2 = create(:issue, title: 'issue_2', project: project)
       issue_3 = create(:issue, title: 'issue_3', project: project)
       issue_4 = create(:issue, title: 'issue_4', project: project)
       issue_5 = create(:issue, title: 'issue_5', project: project)
-      issue_6 = create(:issue, title: 'issue_6', project: project)
-      issue_7 = create(:issue, title: 'issue_7', project: project)
-      issue_8 = create(:issue, title: 'issue_8', project: project)
 
       # Assign labels to issues disorderly
       issue_4.labels << label_1
@@ -37,26 +29,65 @@ feature 'Issue prioritization', feature: true do
       issue_5.labels << label_3
       issue_2.labels << label_4
       issue_1.labels << label_5
-      issue_6.labels << label_5
-      issue_7.labels << label_5
-      issue_8.labels << label_5
 
+      login_as user
       visit namespace_project_issues_path(project.namespace, project, sort: 'priority')
 
       # Ensure we are indicating that issues are sorted by priority
       expect(page).to have_selector('.dropdown-toggle', text: 'Priority')
 
-      page.within('.issues-list') do
-        expect(find('> li:nth-of-type(1)')).to have_content('issue_4')
-        expect(find('> li:nth-of-type(2)')).to have_content('issue_3')
-        expect(find('> li:nth-of-type(3)')).to have_content('issue_5')
-        expect(find('> li:nth-of-type(4)')).to have_content('issue_2')
+      page.within('.issues-holder') do
+        expect(page).to have_selector('.issues-list > li:nth-of-type(1)', text: 'issue_4')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(2)', text: 'issue_3')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(3)', text: 'issue_5')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(4)', text: 'issue_2')
 
         # the rest should be at the bottom
-        expect(find('> li:nth-of-type(5)')).to have_content('issue_7')
-        expect(find('> li:nth-of-type(6)')).to have_content('issue_8')
-        expect(find('> li:nth-of-type(7)')).to have_content('issue_1')
-        expect(find('> li:nth-of-type(8)')).to have_content('issue_6')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(5)', text: 'issue_1')
+      end
+    end
+  end
+
+  context 'when issues have multiple labels' do
+    scenario 'Are sorted properly' do
+
+      # Issues
+      issue_1 = create(:issue, title: 'issue_1', project: project)
+      issue_2 = create(:issue, title: 'issue_2', project: project)
+      issue_3 = create(:issue, title: 'issue_3', project: project)
+      issue_4 = create(:issue, title: 'issue_4', project: project)
+      issue_5 = create(:issue, title: 'issue_5', project: project)
+      issue_6 = create(:issue, title: 'issue_6', project: project)
+      issue_7 = create(:issue, title: 'issue_7', project: project)
+      issue_8 = create(:issue, title: 'issue_8', project: project)
+
+      # Assign labels to issues disorderly
+      issue_5.labels << label_1 # 1
+      issue_5.labels << label_2
+      issue_8.labels << label_1 # 2
+      issue_1.labels << label_2 # 3
+      issue_1.labels << label_3
+      issue_3.labels << label_2 # 4
+      issue_3.labels << label_4
+      issue_7.labels << label_2 # 5
+      issue_2.labels << label_3 # 6
+      issue_4.labels << label_4 # 7
+      issue_6.labels << label_5 # 8  – No priority
+
+      login_as user
+      visit namespace_project_issues_path(project.namespace, project, sort: 'priority')
+
+      expect(page).to have_selector('.dropdown-toggle', text: 'Priority')
+
+      page.within('.issues-holder') do
+        expect(page).to have_selector('.issues-list > li:nth-of-type(1)', text: 'issue_5')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(2)', text: 'issue_8')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(3)', text: 'issue_1')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(4)', text: 'issue_3')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(5)', text: 'issue_7')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(6)', text: 'issue_2')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(7)', text: 'issue_4')
+        expect(page).to have_selector('.issues-list > li:nth-of-type(8)', text: 'issue_6')
       end
     end
   end